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31 pagesInternational audienceThe goal of this paper is to describe Zermelo's navigation problem on Riemannian manifolds as a time-optimal control problem and give an efficient method in order to evaluate its control curvature. We will show that up to changing the Riemannian metric on the manifold the control curvature of Zermelo's problem has a simple to handle expression which naturally leads to a generalization of the classical Gauss-Bonnet formula in an inequality. This Gauss-Bonnet inequality enables to generalize to Zermelo's problems a theorem by E. Hopf establishing the flatness of Riemannian tori without conjugate points

On Zermelo-Like Problems: Gauss–Bonnet Inequality and E. Hopf Theorem